727 not upshifting, wierd pressures
#2383193
10/06/17 10:59 PM
10/06/17 10:59 PM
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Joined: Sep 2003
Posts: 372 Ohio
jensenguy
OP
enthusiast
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OP
enthusiast
Joined: Sep 2003
Posts: 372
Ohio
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I'm just getting back into a Transmission that I rebuilt years ago, and didn't want to upshift afterwards. Been sitting 5? years. I seem to recall I was not getting any governor pressure at the time.
I took the extension housing off, and sure enough the valve was stuck fast in the governor. I took it all apart and cleaned it up, no debris to speak of inside. Moves freely, put it all back together.
So now, I'm getting into second gear in drive (Can't tell if it is a incredibly soft upshift or starting in second) But not third. I'm doing this on Jack stands so that may be affecting, but getting to 3000 rpm no upshift.
I check my line pressure in Drive at 1000rpm, (again not sure if it is in 1st or second at this point) and see about 100psi line pressure with the thottle lever all the way forward. When I move it all the way back it drops to 85psi or so. I'm guessing this is an internal leak somewhere?
I'm planning on checking Gov. pressure as well, once things cool down.
Last edited by jensenguy; 10/06/17 11:03 PM.
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Re: 727 not upshifting, wierd pressures
[Re: jensenguy]
#2383292
10/07/17 03:45 AM
10/07/17 03:45 AM
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Joined: Jan 2003
Posts: 25,877 Rio Linda, CA
John_Kunkel
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Posts: 25,877
Rio Linda, CA
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I'm doing this on Jack stands so that may be affecting, Jack stands are the absolute worst place to test a transmission's performance. Put it on the ground and check it.
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Re: 727 not upshifting, wierd pressures
[Re: jensenguy]
#2383495
10/07/17 05:34 PM
10/07/17 05:34 PM
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Joined: Jan 2003
Posts: 25,877 Rio Linda, CA
John_Kunkel
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Rio Linda, CA
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Disconnect the TP linkage at the trans lever and see if it shifts through all gears and downshifts at a stop. If it does, the linkage adjustment/installation is wrong.
Which carb? If aftermarket does it have the correct Mopar throttle lever extension?
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Re: 727 Governor pressures
[Re: jensenguy]
#2384062
10/08/17 07:40 PM
10/08/17 07:40 PM
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Joined: Jan 2003
Posts: 25,877 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,877
Rio Linda, CA
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At a dead stop 2 psi governor pressure at idle in Drive is considered the max allowable.
Other than sticky valves/weights, the sealing rings are usually the source of governor pressure woes.
The throttle lever movement sounds normal; moving the lever aft compresses a spring so the movement would be expected to increase and, near the end of travel, you're in the kickdown detent so the lever resistance increases.
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Re: 727 not upshifting, wierd pressures
[Re: jensenguy]
#2392451
10/24/17 05:51 PM
10/24/17 05:51 PM
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Joined: Jan 2003
Posts: 25,877 Rio Linda, CA
John_Kunkel
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Posts: 25,877
Rio Linda, CA
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Yes, if the front clutch were inop the trans would drop to 1st gear as soon as the band releases on the 2-3 shift. Starting to sound like a stuck 2-3 shift valve in the valve body.
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Re: 727 not upshifting, wierd pressures
[Re: jensenguy]
#2393105
10/25/17 09:55 PM
10/25/17 09:55 PM
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Joined: Jan 2004
Posts: 8,290 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,290
fredericksburg,va
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Got basically same problem in buddy's trans, first time I found the valve body full of dirt and junk. Put another vb in and still no up shift, second time apart front clutches burnt. Let us know all what you find please. Trans was a new rebuild supposely.
Last edited by cudaman1969; 10/27/17 05:01 PM.
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Re: 727 not upshifting, wierd pressures
[Re: jensenguy]
#2395913
10/31/17 09:59 AM
10/31/17 09:59 AM
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Joined: Dec 2009
Posts: 20,640 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Well, if there is nothing obvious in the trans then the debris is most likely coming from the converter and cooler.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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